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    <title>Document</title>
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    <h1>数字时钟</h1>
    <div class="container">
        <div class="menu">
            <div class="running"><span>开启</span></div>
            <div  class="paused"><span>暂停</span></div>
        </div>
        <div class="clock">
            <div class="clock-item hour">
            <div>时</div>
            <span>00</span>
            </div>
            <div class="clock-item minute">
            <div>分</div>
            <span>00</span>
            </div>
            <div class="clock-item second">
            <div>秒</div>
            <span>00</span>
            </div>
        </div>
    </div>
    <div class="toast">我是提示框</div>
</body>
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